On-Demand ejaculation control. Dapoxetine has been proven in double-blind, placebo-controlled, Phase III clinical trials to make men last up to 300% longer and eliminate premature ejaculation. It starts working in less than an hour, so you can still be spontaneous. With Dapoxetine, you can focus on enjoying better sex instead of being distracted by trying to hold back long enough to satisfy your partner.